Function holochain_types::prelude::ffs::canonicalize

pub async fn canonicalize<P>(path: P) -> Result<PathBuf, IoError> where
    P: Clone + AsRef<Path>, 

Wrap dunce::canonicalize, since std::fs::canonicalize has problems for Windows (see https://docs.rs/dunce/1.0.1/dunce/index.html)